Rotary fan or blower.



F. R. STILL. ROTARY FAN OR BLOWE R. APPLICATION FILED-@113. 10, 1911.

'1', 054,94v7. I Patented Mar. 4, 1913.

INVENTO'R f if WITNESSES:

F. R. STILL.

I. ROTARY FAN 0R BLOWER.

APPLICATION FILED FEB. 10, 1911.

14,054,947, Patented Mar. 4, 1913.

2 SEEETE-BHEET 2.

INVENTOR' UNITED sTA'rEs PATENT OFFIQE.

FREDERICK R. STILL. 0F DETROI'I. MICHIGAN. ASSIGBTOR TO AMERICAN BLOWER COMPANY, OF DETROIT. MICHIGAN. A CORPORATION OF NEW YORK.

ROTARY FAN OR BLOW'EIR.

T0 (7 whom it may con ern Specification of Letters Patent.

Application filed February 10, 191 1. 0 Serial lie it known that T. FREDERICK lt. S'rnm.

a citizen of the United States, residing at 7 Detroit. in the county of \Yayne and State of Michigan. have invented certain new and cation.

and blades E. ii.

The invention relatesto rotary fans or the I like, such as blowers/or pumps. and aims to provide certain inn'n'oveinents therein.

shall lavsti-oiig and durable in construction and which may be conveniently constructed. lt-is at gencral advantage that the blades any suitable Pa tented Mar. 4, 1913. No. 607.771.

tive view ot'on'e of the blades, and Fig. at is a secti n ot' one of the blades onthe line t st. Fig". 2.

Referring to the drawing. represents ba e or frame having bearings l l---l tor the shaft G which carries the fanwheel. The wheel comprises a support D The blades are made up of a plurality of thicknesses or sheets of metal c. c nneclcd to one another and to the support I) m such manner as to brace or rein- The invention aims to provide a fan which I oi tans and the like and the connectitmf thereof to their support shall be Stltillfl and durable. l t moreover. Q ])Q(.lflll desir able that the construction shall possess strength and endurance where the Fan is used under conditions where the blades theret'it are liable to comein contact with relatively heavy orsolid bodies. in order that they may withstand the resulting collisions with little or no injury. .\n example of such use is where the tan is used as an exhaust fan in connection with woodworking machines for removing waste trom the material operated on, in which waste are liable to be blocks or pieces of wood.

'ith the foregoing objects in v ew the blades of the tan are made of two or more thickne ses or sheets or plates of material united to one another and to their support in such manner that the. respective thick ncsscs. sheets or plates act as braces or reinforcements for one another. In order to attain alirm and strong connection between the blades and the hub. the latter may be provided with aconical or other suitable project-ion. in. addition to the usual disk or flange. whcrebya connection of considerable extent. issecured.

"lhc invention has been illustrated as cin bodied in a construction. such as referred to above by way of example. and will'more particularly be described in connection with such illustration.

the tan-wheel or rotor. Fig. 3 is a pet-spec for e one another. The sheets 0. e are preferably prcvided with flanges c. a at; the edges where they are connected to the support and the connection preferablv effected by means of bolts or rivets 6 i The sheets or thicknesses c. c arepreferablv' scpa rated or spaced ap ntatt the edges where the are connected to the hub or base, leaving a space c lutween the ditl'crent sheets or thicknesses and are preferably connected together. preferably at one or more of their edges. as lhus constructed, one ofthe shectsor thicknesses acts as a truss or rein t'oi'cin element for the other a strain on one sheet or thickness being transmitted and sustained by another. l urthermore, the blades will possess a ccrtain elasticity and dents and mutilations which may be produced in one sheet or thickness of the blade will not be transmitted to other sheets or thicknesses.

The blades may be formed of either a single sheet of material folded to constitute the several thicknesses. or may be formed of a plurality of sheets united in a suitable manner. l lu't'hermore. the sheets or thicknesses may be given any suitable contour or shape so that the blad s may have the proper contour to ell'ect their functions.

The suppor for the blades may be of an suitable t'orm. but in order to provide an extended conncction tor the blades itmay be made in the form of a cone having an annular tlanpge or disk at its base. As here shown. the l-a.c omprises a hub or web F, which tits on the shut": t. and a cone G and an annular tl:lEl J 't' or disk ll fastened to the rim ot' the hub or web l as by rivet The flanged edges ot the sheets or thicknesses a, of the blades are l'astencd to the parts G and ll of the support. v

The fan may be honsml \VitlllI Ltl casing L having inlet and outlet openings J and K therein;

The invention is applicable ,to other forms of blades and to fans or propellers in general, and while I have illustrated and described but one'embodiment of the invention, it is not to be understood as limited edge of the blade.

2A fan wheel having blades which are approximately radial near the hub and curved forward toward the periphery, with its blades formed of two thicknesses of plate joined at the 'free peripheral edge to close the space between them, and spaced apart at the supported edge of each blade.

3. A fan wheel comprising blades and a support,.the latter comprising a hub and disk, the blades attached to said support at the back and having free front edges and free peripheral edges, each blade formed of two thicknesses of plate joined at the free edges of the blade, andspaced apart and united to the support on the supported edges of the blade.

4. A fan wheel comprising blades and a support for said blades, said support comprising a disk and a central conical projection thereon, and each of said blades being composed of two thicknesses of plate joined at the peripheral edges of the blade and spaced apart at the attached edges of the blade, and there united to said support, whereby they act to brace each other.

5. A fan whee] having blades each of which is composed of a single piece of metal plate bent upon itself, the bent-over portions of said plate being connectedat the outer edge of the blade by the bend and the inner edges of said bent-over portions being spaced apart, whereby eachgacts to brace the other, the edges of said bent-over portions being brought together at a free edge of the blade and united to close the them.

In witness whereof, I have hereunto si ned my name in the presence of two substgibing witnesses.

FREDERICK R. STILL.

Witnesses:

ARTHUR C. FRAsER, THOMAS F. VVALnAoE.

space between 

